First light Ascension morning. From the top of the tower at the College of Transfiguration voices rise in song. Felicity's delight turns to horror when a black-robed body hurtles over the precipice & lands at her feet. Her fiance Father Antony recognizes the corpse as Hwyl Pendry a former student who has been serving as Deliverance Minister in a Welsh diocese. The police ignoring the strange emblem of a double-headed snake clutched in the dead man's hand label the death as suicide. But Hwyl's widow is convinced otherwise & please for Felicity & Antony to help her uncover the truth. Matters grow murkier as Felicity & Antony leading a youth pilgrimage through rural Wales encounter the same sinister symbol as they travel. Lurking figures following them. Then a body is found face-down in a well...